There is no unique answer, I believe, as it all dependes on two factors - projected data and the loss function that reflects the preferences of a given decisionmaker. Given that by 2100 all the officials will be long gone, then todays optimal decision could indeed be very risk seeking; therefore adopting the lowest predicted raise in the sea level (providing none of the official is really concerned about the long run consequences of such a decision) is a reasonable strategy. On the other hand - judging from the Fig.2 in the report - the forecast value is very questionable by itself anywhere beyond 2030, hence the decision to adopt a lower forecasted level may still be acceptable. At first glance, e.g. it does definitely look as if the sea level is going to raise, but I have serious doubts about the exponential rate.